CITIZEN CT-S651 - Manual (Page 36)

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While paper is loaded, press and hold the FEED button while turning the power
on. Hold the FEED button down for about one second and then release it to start
self-printing. The printer prints its model name, version, DIP switch settings,
memory switch settings, and a list of built-in fonts.
Note:
*: Printers with a USB interface do not have DIP switches, so the DIP switches all appear off on the
self-printing printout.
4.4 Self-printing
DIP switch settings*
(USB or Serial interface
models only)
Buffer size
Serial communication
status
(USB or Serial interface
models only)
Interface
Firmware version
Memory
switch
setting